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AIC1842

Part Number	AIC1842
Manufacturer	Analog Intergrations Corporation
Description	High Efficiency 1.5X charge Pump
Published	Jun 16, 2015
Detailed Description	AIC1841/2 High Efficiency 1.5X charge Pump For White LEDs Backlighting FEATURES 1MHz Switching Frequency 2.7V to 5.5V I...
Datasheet	AIC1842 PDF File

Overview

AIC1841/2 High Efficiency 1.
5X charge Pump For White LEDs Backlighting FEATURES 1MHz Switching Frequency 2.
7V to 5.
5V Input Voltage Range Low Shutdown Current: ≦1µA Regulated 20mA Full-Scale Output Current 32-Position Linear Scale with Digital Control High Accuracy Brightness Matching 33% Less Input Current Than Doubler Charge Pump No Inductors Required Build-in Soft-Start Current Limit and Over Temperature Protection 12-Pin (AIC1841) and 16-Pin (AIC1842) QFN Package APPLICATIONS Cellular Phones PDAs Digital Still Cameras Handheld Devices White LED Backlighting GENERAL DESCRIPTION The AIC1841 and AIC1842 provide 4 and 6 LED current source outputs with regulated constant current for uniform intensity.
The AIC1841/2 is the low noise, constant frequency charge pump DC/DC converter that uses 1.
5X conversion to increase efficiency in white LED applications.
The devices can be used to produce current levels up to 20mA for each output from a 2.
7V to 5.
5V input.
Low external parts counts (two 1 μ F flying capacitors and two small bypass capacitors at VIN, and OUT) make the AIC1841/2 ideal for small, battery-powered applications.
EN/SET interface is used to enable, disable and set the LED current for a 32 level logic scale LED brightness control.
Built-in current limiting, with thermal shutdown provide protection to the AIC1841/2 against fault conditions.
Automatic softstart circuitry prevents excessive inrush current during start-up.
1MHz high switching frequency is enable to use tiny external components.
The AIC1841 is available in a 12-pin thin QFN package, and the AIC1842 is available in a spacesaving 16-pin QFN package.
Analog Integrations Corporation 3A1, No.
1 Li-Hsin Rd.
I, Science Park, Hsinchu 300, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 www.
analog.
com.
tw DS-1842P-02 041707 1 TYPICAL APPLICATION CIRCUIT AIC1841/2 VIN 2.
7V~5.
5V Cin 1uF 4 C1uFFLY1 5 10 6 Cout 11 1uF 9 C1+ C2+ C1- C2- VIN D1 OUT D2 EN/SET D3 GND AIC1841 D4 7 8 C1uFLFY2 12 LED1 1...

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